Calcute: freeware calculator

Capable, compact, free calculator for Windows

Replace your regular Windows calculator with this unobtrusive scientific tape calculator. Sleek and functional, it improves upon traditional calculators with some unique abilities. In single-line mode, dock it conveniently right above your taskbar for ready access:

Select multi-line mode to expand it into a full tape calculator that you can stretch at will. Hide or show the keypad: either click the calculator buttons with the mouse or type directly on the tape. It works either way.

Calcute is more evolved than a plain calculator: it is in fact an
expression evaluator. Unlike limited hand-held devices
where numbers disappear as soon as you enter the next one, Calcute lets
you enter a complete expression as if you
were using a regular text editor. You can see what you are doing so
you can easily make corrections. Type what you want to
calculate, press Enter to get the answer.

Retain and review past calculations as if you were using a long paper tape. But here you can also go back up the tape, edit past expressions and re-calculate them. You can even retain your work by saving everything to a file, to be restored later.

A number of interesting features are present in this little tool.
Browse the site to learn about them, or just download the software and
try it out. It's free! It's also clean: no spyware, no adware, nothing
more than this handy calculator.